On Mon, Jun 13, 2022 at 9:11 AM Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote:
>
> On 12.06.2022 23:39:19, Dario Binacchi wrote:
> > Adding Netlink support to the slcan driver made it necessary to set the
> > bitrate to a fake value (-1U) to prevent open_candev() from failing. In
> > this case the command `ip --details -s -s link show' would print
> > 4294967295 as the bitrate value. The patch change this value in 0.
> >
> > Suggested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> > Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
> > ---
> >
> > (no changes since v1)
> >
> > drivers/net/can/dev/netlink.c | 12 +++++++++---
> > 1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/can/dev/netlink.c b/drivers/net/can/dev/netlink.c
> > index 7633d98e3912..788a6752fcc7 100644
> > --- a/drivers/net/can/dev/netlink.c
> > +++ b/drivers/net/can/dev/netlink.c
> > @@ -505,11 +505,16 @@ static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
> > struct can_ctrlmode cm = {.flags = priv->ctrlmode};
> > struct can_berr_counter bec = { };
> > enum can_state state = priv->state;
> > + __u32 bitrate = priv->bittiming.bitrate;
> > + int ret = 0;
> >
> > if (priv->do_get_state)
> > priv->do_get_state(dev, &state);
> >
> > - if ((priv->bittiming.bitrate &&
>
> What about changing this line to:
>
> if ((priv->bittiming.bitrate && priv->bittiming.bitrate != -1 &&
That you are right. The code becomes much cleaner.
>
> This would make the code a lot cleaner. Can you think of a nice macro
> name for the -1?
>
> 0 could be CAN_BITRATE_UNCONFIGURED or _UNSET. For -1 I cannot find a
> catchy name, something like CAN_BITRATE_CONFIGURED_UNKOWN or
> SET_UNKNOWN.
>
Personally I would use CAN_BITRATE_UNSET (0) and CAN_BITRATE_UNKNOWN (-1).
Let me know what your ultimate preference is.
Thanks and regards,
Dario
> The macros can be added to bittiming.h and be part of this patch. Ofq
> course the above code (and slcan.c) would make use of the macros instead
> of using 0 and -1.
>
> Marc
>
> --
> Pengutronix e.K. | Marc Kleine-Budde |
> Embedded Linux | https://www.pengutronix.de |
> Vertretung West/Dortmund | Phone: +49-231-2826-924 |
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--
Dario Binacchi
Embedded Linux Developer
dario.binacchi@xxxxxxxxxxxxxxxxxxxx
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